P 118The refractive error outcome of triple-procedure operation after 2 years
A. Fell, H. Tavassol, K. Engelmann
Purpose: For triple-procedure operation (keratoplasty, cataract extraction and intraocular lens implantation) precise forecast of corneal curvature is necessary for intraocular lens power calculations. For this purpose the partner eye ´s corneal curvature has been measured for intraocular lens power calculations. The spherical equivalent of standard intraocular lens implantation and the postoperative final refractive result in triple procedure were compared.
Methods: Data were analyzed for 178 triple-procedure operations performed between 1994 and 1998. We present the evaluation of 57 patients with following diagnosis: 39% corneae dystrophy, 28% Keratitis, 28% corneae decompensation after surgery and 5% others. For each patient, refraction, visual acuity, endothelial cell count and keratometry reading were measured initially and every 6 months.
Results: The mean follow-up after 24 months (13 54 months) shows the mean spherical equivalent of 0 diopters with a standard deviation of 3.50 diopters. Olsen and Bargum published a mean spherical equivalent of - 0.43 diopters with 1.03 diopters standard deviation after cataract extraction and intraocular lens implatation. (T. Olsen, R. Bargum; Outcome monitorig in cataract surgery. Acta-Ophthalmol-Scand. 1995; 73:433-7)
Conclusion: This study provides evidence that it is possible to calculate intraocular lens power from cornea curvature measurements in the partner eye. The higher standard deviation is counterbalanced by the fact that only one operation is necessary. Additionally a second operation results in higher losses of endothelial cell density.
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